Rock crusher



- Feb. 2s, 192s. l 1,660,652

A. MOLANDER ROCK CRUSHER A. MOLAN DER Feb. 28, 1928.

ROCK CRUSHER 2 Sheets-Sheet 2 INVENTOB: #ga/@w 5y fm Patented Feb. 2s,v y192s.

ALFRED Mona-NBER, oir sfr. PAL, MInNs-OTA.

Rooxennsnnnf r f applicati@ inea october' 15, 192e.\ serial no. 141,726. s

My linvention relatesto rockl Crushers and thellnain object isto provide a simple and highly eilicientl rock criis'her forreducing various mixedr sizes of rock to uniformly sizedy 5 pieces in' a comparatively vshort time. A further object is to further improve on'vrny patented rock Crusher issued August 24th, 1926, Patent Nuniber 1,597,207. n

In the'accompanying'dravvingy v "Figo 1'y is a vertical, central elevation of niyiinproved rock'cr'usherl y Fig. 2 is'a horizontal; sectionas on-hne 22in Fig. 1 showiiig'tlie'rru'sher heady ot" my,V device in operative position.

Referring to the cured with bolts V6A to theftopofthe Crusher body 7, the lower endof said body flanged externally as 8 for securingI it' withy bolts^ 2o 9 tothe correspondingly fiangedupper endl.: of a bell shaped outlet chainb'er 10. All-'said parts,.th e; feed hopper, the body 7: andthe chamber 10, arent 'circular' conformation horizontally and alignedconcentrically Ona,

vertical line designatedv as A., The feed, hopper has fan integral elevated bearingppart` 11 for housing the upper end of a vergtial disposed breaker-head shaft 12, the lower end ofthe said shaft as at124rbeingl' rotat- B able in a vertical bearing 13 ixedas at 13'* tothe bottoni of chamber'lO,

The .lower fend ,12A ofY haft-121s journaled concentrically: of the centerline' A fand on said part 12A isxed bevelfgea'rl 1 4: driven by .a bevel pinion-15 on l.a1-'shaft 1 6 which Vis rotated by'4 any ,suitable drivingl means (not l shown) Shaft 12 is offset preferably f justfabove gear 14, as; ,12B in Fig.` 1, shifting its center aste-line B. Froxnits eccentric 9 the true'center of the-shaft (llne B)v isfstraight butinclinedl inwardly yuntil line B converges with the vertical .center line as at C,near or within'the bea-ringfll. Thus the' lshaft 12, above the'pa'rtw12A, will gyrate 5 about thev true center" lineiA `the greatest A gyration being` at the,of`set` and'gradually diininishingv to,v point C. vThat part o' shaft 12 above point C will g'yr'ate ysoine and this part lias-a flanged bushing" 1 7 the'dovvni '50 wardly' exposed flange-facet17L i of which is preferably rounded or'co'n'cav'ed "concentric witheenter C asindiea'tedfby radial line'D inlig;I 1y and bears on a correspondingbearf `ingH surfacev on",the,flippery end ofy a fixed' Y bushing.l8fin`bearingf11- i The l11111111311 @neef 'Shaft 12 protrae@ above drawings by` reference numerals, 5V designates a feedv hopperse# cr'us'her head'section27 of 'specialiforni `presently to be described said erus'lerhead bushinglv and is threaded, 12?:forenyga'gernent by a nut19 whiclrisA keyed to l the shaftbyv removable keys 2O whioh'serv'e tojhold thenut in non-rotating' relation Vto the shaft 12. l19R is a ball or other suitable type bearing between kthe nut 19, and the adjacent top of bushing'1,f i

21 is a downwardly tapering crushing l chamber suitably secured inthe body meinf ber vTand may alsobe held securely between the receiving hopper 5 y and the' chamber 10, .Y andfits d own'vvard lyy taperingbore concentric of thefline A. Thefroclrcrushing takes place entirely within this hopper andV '70 ,theope'n end of the latter' registers with' the i11g' l3.' The'upper end ofthejshatt i'sfsiip-"Bo v ported by "bea-ring 19R previoiisly desorbedl A 'portion of shaft 12j' jnstfabove the'lovv opening ofcha1nbe1'f'21 is splinedas'12; for f retainingffa correspondingly" splined lower,y

coinpr'ising A alsoVV an upper stationary Vsection 'f 28j.V AThe latte'r'is suspended iwith' itsloweij` ond closed tothe upper endv of section 27 and tapers upwardly therefrom tofafpproi;iv '95 vin'atelyl a level Vwith thetop of f`1ha1``1bfe`ri21. f The suspending ineansvtherefor (28) consists of ya number of cireularly' spaced upright bolts ,29" passed 'downwardly thruthe outer p'art of thev lange'd l,bushing 17 lthence thru "cor-v respionding apertures11A V i11 the bearingf11` and thefthreaded loweren'dsfof said'bol'ts"v f V30l in the upper fend o'fferus'her YVl'1jead'fsee tion"V 28.1'V ySaid sentieriy A,28 'isfboredfvto be concentric of the shafitj 12v above its fspline'sfVIA '12s, that is"A concentricof. centerline B.'

Thus it will'be'seenfthatfseetion 28`d`oe'sf'not rotatel ,iWth shaft"y 12 ybut when thef latter vis rotatedfthehead a gyratory Imovement andA itsi'out'er surface AInay be said tofhave a horizrontalfvveaving' 'nov'en'ient 'whichbreaks vthe rocksvbetween it and the adjacent chamber 21. As the breaking of rocks continues the piecesare of course gradually reduced in size and drop further down in the hopper and toward the lower circular edge of head 2S and-just below said edge the said rocks are reducedtoa certain predetermined 'size by the lower Crusher headsection 27 which `Thus it is readily seen that head 28 is suspended between the upper surface of crusher head section 27 and the adjusting collar 31A.

F or convenience I will hereinafter designate the upper Crusher head section as the breaker head and therlower section as the cutter fliead, the latter being comparatively' short andV having an' angular approximately circular cuttingedge 27@ extending from its lowest point on `about a level with the lowest edge of chamber 21 to a high point at'its upper level, as shown clearly in Fig. 1. ,It will be fully yunderstood that the cutter head .y bore is concentric of center line B (on shaft 12)v and -it is important that the curvature of the cutting edge is such that any point `on its perimeter isequi-distant from the adjacent wall of 'chamber 21 horizontally.l In

other words the cutting edge 27C is one inch Y from the chamberv wall, for exampleV if one inch size of crushed rock is desired. f That part of the cutter head above its Acutting edge is also 'tapered upwardlyand below said,` edge suitablyy tapered downwardly to permit the crushed rock to fall freely down to the discharge chamber. lt will be understood that rotating of shaft 12 will rotate the cutter head and all parts of the c'ut-Y ting edge of the latter will always be avuniformV distance from the yadjacent walls but thefupwardly tapering exterior causesv the rocks to roll andV get wedged and broken smaller .as they 'gravitate downwardly and are'reduced to a uniform'size before" they can drop past the cutting edge and onto the "deliveryaprom j From apron 22 is extended Y upwardly/a, tubular shaft housing'22H extending approximately to the top of hous-V Y ing. 10V andv on its upper'end I provide a loose collarl 32 about shaft 12 to prevent vfall- ',ing, stones from. dropping' Vonto the gears in the lowerpart ofthe housing. vThe use ofrmy device has Vbeen fairly disclosed. An important improvement in it is the'ffianged riding bushing 17 with the inserted hanger bolts 29 extending through the large bores 11A in thebearing v11, saidbores being large enough so the boltsv can sway therein enough to compensate for the gyratory movement of the! upper end 'of the crusher head 28. This manner of suspending the crusher head is vsubstantial and proven highly satisfactory.

The gyratory movement ofthe breaker head,'which may also be aptly termed a' cam has action, breaks up the large stones in the downwardly tapering space between .said head and the wall of the chamber,v,liter`ally imparting-.a rotary smashing blowk to the' rocks and'brealing them Vinto smaller and smaller pieces. 'The same breaking action 1s.

caused by therupper area ofthe cutter head which reduces the stones to smaller sizesand thel cutting *edgey 2'("31brealrs and cuts the? f stone to a uniform `size before it can pass through. to the apron.

It will be noted'that as shown in Figi-'1,' 'Y i l'at 35, the upper edge ofthe cutterv head is i inward of the"lowerfedge of thecrusher A.

head providing an enlarged space for the broken rock to fall `into and providing forV wear and tear on the Crusher' head which may befused until worn evenV with said'up` per edgeof the cutter head.

It isobvious that stones precipitating in- A to the space aroundl the cutter head Vwill gravitatev towardV the 'bottom ofthe latter -l but will be broken into the 'desired size at .any elevation where the angular cutting edge crushes it; The main.V shaft and its cutting hea-d may be rotated eitherway thus prolonging the usefulness thereof for if it is rotatedy onek way only Vthe cutting. edge would be worn out sooner at one side only. l claim: f

1. Inl a rock crusher having a. feed hopper, a roclr crushing chamber and anzoutlet chamber in vertical alinement, a rotatable shaft Varranged centrally of the Crusher, a crusher head removably arranged onsaidshaftand" loo comprising a non-rotatable suspended Vupper section and a lower cutting section lkeyed `to the shaft, anda bearing forthe shaft in the lower part ofthe Crusher, and a bear i ing in the upper central part ofthehop'per."

a'lined vertically with the said lower bearf ing, said vshaft havinga singlev offset adjacent its lower bearing, the shaft centerinclined from said offset toa point of convergence with the vertical center of the up- 'per bearing at or near said upper bearin y to provide a gyratory movement of the sha tf andv crusher headjwithinA the rock crushing chamber, verticallv adjustable'means supportingthe'lower end of said shaft and means at the .upper end of said shaft adapty ed to support theupper end thereof according to the position of said'lower sup.-

porting means, and simultaneously support the non-rotatable section fof the crusher head continuously concentric fof 'the shaft.

2. Thestructure specified in claim in which ysaid upper section ofthe crusher head comprises lan upwardly tapering. member,`

suspending means therefor comprising aver'- tically arranged bushing about the upper part of the shaft and having a flange at its Vupper end, circularly arranged apertures provided near the perimeter of said flange, bolts passed downwardly one through each aperture andthe vlower end of each bolt threaded into the upper end of the crusher head, saidvbearing over lthe receiving hopper having an aperture for each ysaid bolt--V to pass through and'each bolt head adapted-to engage the upper face of said bushing flange to carry a portion of the weight ofthe crusher head and means n said shaft engaging the upper end of said Icrusher head to prevent vertical movement thereof.

' 3. The structure specified inrclaim 1f, in which said upper section of the crusher head comprises an upwardly tapering member,

lsuspending means therefor comprising aV vertically arranged bushing about the upper part of the shaft 'and having a flange at its upper end, circularly arranged apertures provided near the perimeter ofsaid flange, bolts passed downwardly one through each aperture and the lower end of each boltV threaded into the upper end of the crusher head, said bearing over theireceiving hopper having an aperture for each said bolt to pass through and each bolt head adapted to engage theupper face of said bushing flange to carry a portion of the weight of the crusher head and means on said shaft engaging the upper end of said crusher head to prevent vertical lnovementthereof,

said` latter means vcomprising a pair of threaded spacing nutsl on the shaft, one adjacent the upper end of the crusher head and the` other to serve as a jambnut.

a V4. The structure lspecified in claim `1, inv

which said upper section ofthe crusher head comprises an upwardly tapering member,

suspending meanstherefor comprising a verticallyfj arranged bushing about the upper` n parti of the shaft andl vhaving a flange ati, its upper end,circularly arrangedv apertures provided nearthe 'perimeter of said flange, bolts passed downwardly one through each aperture and thel lower. end -of each bolt i `its upper end exposed` and having its eX- posedend rounded on a radius from the point of convergence ofthe vertical center line and the angular center line of the shaft described, said .flange-of the shaft bushing having a correspondingly curved downwardly exposed circular face engaging said upper end of theiixed bushing. v

5. The-structure specified in claim l, in

which the lower section of'each crusher headV comprises a-rock cutting and breaking element rotatable with the shaft and splined' thereto, saidlower member having a cutting 'edge arranged in an angular plane eXtending from a low point in horizontal spaced relation to the lower end of said crushing chamber thence upwardly to a. level just below the lower face of the upper crusher head,

the entire edge of said cutting element being uniformly spaced fromthe adjacent wall of the crushingchamber to provide a uniform size of opening for crushed rock to pass through. l

ture. s

f ALFRED .MOLANDER In testimony lwhereofI'aliX `my signal 

